Index: include/llvm/Support/Path.h =================================================================== --- include/llvm/Support/Path.h +++ include/llvm/Support/Path.h @@ -423,6 +423,13 @@ /// @result The cleaned-up \a path. StringRef remove_leading_dotslash(StringRef path); +/// @brief In-place remove any './' and optionally '../' components from a path. +/// +/// @param path processed path +/// @param remove_dot_dot specify if '../' should be removed +/// @result True if path was changed +bool remove_dots(SmallVectorImpl &path, bool remove_dot_dot = false); + } // end namespace path } // end namespace sys } // end namespace llvm Index: lib/Support/Path.cpp =================================================================== --- lib/Support/Path.cpp +++ lib/Support/Path.cpp @@ -671,6 +671,41 @@ return Path; } +static SmallString<256> remove_dots(StringRef path, bool remove_dot_dot) { + SmallVector components; + + // Skip the root path, then look for traversal in the components. + StringRef rel = path::relative_path(path); + for (StringRef C : llvm::make_range(path::begin(rel), path::end(rel))) { + if (C == ".") + continue; + if (remove_dot_dot) { + if (C == "..") { + if (!components.empty()) + components.pop_back(); + continue; + } + } + components.push_back(C); + } + + SmallString<256> buffer = path::root_path(path); + for (StringRef C : components) + path::append(buffer, C); + return buffer; +} + +bool remove_dots(SmallVectorImpl &path, bool remove_dot_dot) { + StringRef p(path.data(), path.size()); + + SmallString<256> result = remove_dots(p, remove_dot_dot); + if (result == path) + return false; + + path.swap(result); + return true; +} + } // end namespace path namespace fs { Index: unittests/Support/Path.cpp =================================================================== --- unittests/Support/Path.cpp +++ unittests/Support/Path.cpp @@ -844,4 +844,24 @@ Path2 = path::remove_leading_dotslash(Path2); EXPECT_EQ(Path2, ""); } + +static std::string remove_dots(StringRef path, + bool remove_dot_dot) { + SmallString<256> buffer(path); + path::remove_dots(buffer, remove_dot_dot); + return buffer.str(); +} + +TEST(Support, RemoveDots) { + EXPECT_EQ("foolz/wat", remove_dots("././/foolz/wat", false)); + EXPECT_EQ("", remove_dots("./////", false)); + + EXPECT_EQ("a/../b/c", remove_dots("./a/../b/c", false)); + EXPECT_EQ("b/c", remove_dots("./a/../b/c", true)); + EXPECT_EQ("c", remove_dots("././c", true)); + + SmallString<64> Path1("././c"); + EXPECT_TRUE(path::remove_dots(Path1, true)); + EXPECT_EQ("c", Path1); +} } // anonymous namespace